The doublet oscillator-strength ratios ρn of the cesium principal series (62S1/2−n2P3/2,1/2) have been measured for principal quantum number n = 7–21. Both emission and absorption spectroscopic measurements were performed with a 9.1-m focal-length spectrometer. The results show that ρn increases monotonically with n. Discrepancies between emission and absorption results are attributed to collisional mixing of the excited-state populations. Oscillator strengths of both fine structure lines were obtained from the absorption measurements. These agree substantially with similar work by Lorenzen and Niemax [ J. Phys. B 11, L723 ( 1978)]. Fano X parameters derived from the measured results are found to decrease monotonically with n. The value of X, extrapolated to the ionization potential, is 2.05 ± 0.03, in good agreement with recent laser-excited atomic-beam results of Raimond et al. [ J. Phys. B 11, L765 ( 1978)]. This makes unlikely the existence of a pole of ρn in the discrete spectrum, which requires that X have the value 2.
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